[Xen-users] pv_ops dom0 kernel and VT cpu extensions

[Gerry Reno <greno@xxxxxxxxxxx>]

I compiled a pv_ops dom0 kernel from Jeremy's latest git tree and 
upgraded Xen to 3.4.1 following one of Boris' blog entries.  From the 
Xen perspective everything seems to work as expected.  But, I want to be 
able to run both Xen and KVM existing guests in a single cloud on a farm 
of VT-enabled machines.  So after booting into the new pv_ops dom0 
kernel as a test I tried starting one of my KVM guests.  It ran 
extremely slow so I knew immediately that it wasnt' using the VT 
acceleration.  I then looked at /proc/cpuinfo and saw that the VT cpu 
flag (svm on this machine) was not there.  The machine has a VT 
processor and hardware virtualization is enabled in the BIOS and I 
rebooted to check with a regular kernel and it of course the guest runs 
with VT acceleration there.  My question is how can I get pv_ops dom0 
kernel or Xen 3.4.1 to pass the cpu VT flags through so that existing 
KVM guests will run with cpu VT acceleration at full speed?
-Gerry


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